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Alloy steel is steel that is alloyed with a variety of elements in total amounts between 1.0% and 50% by weight to improve its mechanical properties. Alloy steels are broken down into two groups: low-alloy steels and high-alloy steels. The difference between the two is somewhat arbitrary: Smith and Hashemi define the difference at 4.0%, while Degarmo, et al., define it at 8.0%.Most commonly, the phrase "alloy steel" refers to low-alloy steels.
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“In my opinion, compared with other cars, the Dongfeng windmill is like a BMW in a car. The grade is not the same.†In the eyes of Zhengzhou truck owner Zhou Duanchao, Dongfeng is a luxury car in a commercial vehicle. 
Speaking of the fate of Duan Yanchao and Dongfeng Windmill, we must talk about it from twenty years ago.
In the past 20 years , Duan Yanchao saw opportunities for the development of highway logistics and began to run trucks in Zhengzhou.
“The earliest I bought was the first generation of Pingtou Diesel at the FAW Jiefang Plant in Qingdao. At that time, the car did not help the facility. Later I bought the Dongfeng's classic model 140 long nose truck, which is very durable.†Duan Chaochao recalls.
It was this time of purchase that made Duan Yanchao have a hard feelings for the East Windmill.
In 2006, Dongfeng Tianlong new car went public. Out of concern for the East Windmill and the interest of a senior driver, Duan Yanchao conducted in-depth research on the newly-listed Dragon. Through long-term understanding and observation, he determined that this is a very good quality truck and worth buying. Thus, when the car was purchased again in 2010, Duan Yanchao did not hesitate to choose Dongfeng Tianlong, which became his first Tianlong heavy truck.
Today, Duan Chaochao has four Dongfeng trucks – two Dongfeng Tianlong and two Dongfeng Tianjin.
Reliable economic interpretation of the ideal transport vehicle 
According to reports, Duan Yanchao’s several Dongfeng trucks are mainly engaged in the LTL logistics work from Zhengzhou, Henan Province to Hengshui, Hebei Province. The entire journey is basically a national road, which is about 500 kilometers away and travel time is about 12 hours.
Due to the poor road conditions on the national roads and the long travel time, coupled with the low freight rates, it is difficult to make money under the condition of standard loading. Duan Yanchao’s vehicles are often heavily loaded. Such conditions require particularly high demands for heavy trucks, especially for Requirements such as safety and quality are very demanding. “The quality of Dongfeng Windmill is good, and the comfort of driving is also very good. Even if the road condition is not good, the driver will not be guilty.†Duan Yanchao told reporters.
Not only that, but also the fuel consumption of Dongfeng trucks made Duan Yanchao happy. He told reporters that the 260-horsepower Dongfeng Tianlong with Cummins engine has an average fuel consumption of 2.3 yuan per kilometer; Dongfeng Tianjin with the Cummins engine also has a fuel consumption of 1.8 yuan per kilometer; and the domestic truck heavy truck consumes 3 yuan per kilometer.
Low fuel consumption is undoubtedly the biggest cost savings for Duan Yanchao who often runs the national road. “A Dongfeng Tianlong truck with a length of 9.6 meters is the national road from Zhengzhou to Hengshui, and basically does not need to pay the toll. Most of the cost of the entire journey is fuel costs, and the freight is 3,000 yuan. Remaining around 2,000 yuan, and from Hengshui back to Zhengzhou, the higher freight income, (remove fuel costs) can remain 3000 to 4,000 yuan. In this way, a car to run a trip can earn about 5000-6000 yuan."
"Buy a car to buy only the East Windmill"
It is this reliable and economical Dongfeng truck that completely conquered Duan Chaochao and his family. "One of my sons is following me with a windmill. He also likes the east wind."
For years of use and trust in Dongfeng, Duan Chaochao decided to buy a Dongfeng Wind Turbine in the future. It is understood that among the four Dongfeng trucks he currently owns, there is a Tianlong just purchased.
"As the business grew, I recently added a new Dongfeng Tianlong. My company (Central Plains Express Co., Ltd.) now has more than a dozen medium and heavy-duty trucks. Only four or five of them are new cars. The others are old cars. They Also want to slowly update the vehicle.†Duan Chaochao told reporters that due to the large number of logistics companies, the competition is fierce, the reliability of the vehicle and the brand is more and more important. “Under my leadership, the company’s other partners are now increasingly inclined to purchase Dongfeng Cards.â€
Duan Yanchao said that now there are more and more heavy truck companies in China, and there are also a wide variety of vehicle brands on the road. “However, in Henan, one-third of the cars on the road are Dongfeng windmills. Dongfeng is a big brand, with good performance and reasonable prices. It is trustworthy.â€